A tension measuring device for a holding mechanism such as a ratchet or tie down strap. In one embodiment, a tension measuring device comprises a two-part frame, comprising a movable frame part and a stationary frame part. The movable frame part comprises a first connection portion, one or more biasing element rods, a biasing element lock plate with indicator needle, and one or more rod bolt caps. The stationary frame part comprises a second connection portion, a biasing element chamber, and one or more biasing element rod apertures. Further, the tension measuring device comprises one or more biasing elements and a housing.

A load cell system for measuring rod load in a pumpjack. The system includes a tension load cell operatively coupled to a bridle between first and second bridle cables at a location longitudinally spaced between a horsehead and a bridle plate of the pumpjack. The bridle plate is coupled to the first bridle cable at a first connection point and the tension load cell is coupled to the first bridle cable at a second connection point longitudinally spaced between the bridle plate and the horsehead. The load cell system defines a third connection point longitudinally spaced between the second connection point and the horsehead. The load cell system is configured to maintain substantially constant longitudinal distances between the second connection point and each of the first and third connection points during operation of the horsehead. The load cell system is further configured to maintain a substantially constant lateral distance between the first and second bridle cables at the third connection point during operation of the horsehead.

A load cell system for measuring rod load in a pumpjack. The system includes a tension load cell operatively coupled to a bridle between first and second bridle cables at a location longitudinally spaced between a horsehead and a bridle plate of the pumpjack. The bridle plate is coupled to the first bridle cable at a first connection point and the tension load cell is coupled to the first bridle cable at a second connection point longitudinally spaced between the bridle plate and the horsehead. The load cell system defines a third connection point longitudinally spaced between the second connection point and the horsehead. The load cell system is configured to maintain substantially constant longitudinal distances between the second connection point and each of the first and third connection points during operation of the horsehead. The load cell system is further configured to maintain a substantially constant lateral distance between the first and second bridle cables at the third connection point during operation of the horsehead.

An apparatus includes a cassette configured to hold optical fiber comprising one or more optical sensors. The cassette comprises a spool configured to one or more of extract and retract the optical fiber from the cassette. A fiber monitor is coupled to the cassette. The fiber monitor is configured to monitor at least one parameter of the optical fiber as the optical fiber is extracted from the cassette.

An apparatus includes a cassette configured to hold optical fiber comprising one or more optical sensors. The cassette comprises a spool configured to one or more of extract and retract the optical fiber from the cassette. A fiber monitor is coupled to the cassette. The fiber monitor is configured to monitor at least one parameter of the optical fiber as the optical fiber is extracted from the cassette.

A suspended load calculation device includes a detection unit configured to detect information for specifying a load suspended by a crane, a calculation unit configured to calculate the suspended load based on a value detected by the detection unit, and an acquisition unit configured to acquire a boom length, in which the calculation unit corrects the suspended load by a correction value corresponding to the boom length acquired by the acquisition unit.

A suspended load calculation device includes a detection unit configured to detect information for specifying a load suspended by a crane, a calculation unit configured to calculate the suspended load based on a value detected by the detection unit, and an acquisition unit configured to acquire a boom length, in which the calculation unit corrects the suspended load by a correction value corresponding to the boom length acquired by the acquisition unit.

Delivery devices and methods for delivering a stented prosthesis to a target site are disclosed. Disclosed delivery devices include a handle assembly including an actuator, an inner shaft assembly interconnected to the handle assembly, and are configured to releasably retain the stented prosthesis to the delivery device with at least one elongate tension member. The delivery devices further include a tension management device that is configured to limit the amount of tension that can be applied via the actuator to the at least one tension member. Certain embodiments are configured to apply different tension limits to different tension members that are controlled by a one or more actuators. Other various embodiments include one or more tension adjustors to selectively adjust one or more tension limits.

Disclosed is a device for monitoring icing of a transmission line and preventing a tower from falling down, including a power transmission tower, an insulator string and a connecting mechanism; the connecting mechanism includes two connecting plates, and a monitoring-control connector and a damping component are arranged between the two connecting plates; sides of the two connecting plates are respectively provided with connecting grooves matched with two ends of the monitoring-control connector; the monitoring-control connector is provided with a monitoring component in signal connection with a master station; the two ends of the monitoring-control connector are respectively provided with load release components and are fixedly connected with the two connecting plates, and sides of the two connecting plates further from the monitoring-control component are fixedly connected with the power transmission tower and one end of the insulator string respectively, the other end of the insulator string is hung with wires.

Disclosed is a device for monitoring icing of a transmission line and preventing a tower from falling down, including a power transmission tower, an insulator string and a connecting mechanism; the connecting mechanism includes two connecting plates, and a monitoring-control connector and a damping component are arranged between the two connecting plates; sides of the two connecting plates are respectively provided with connecting grooves matched with two ends of the monitoring-control connector; the monitoring-control connector is provided with a monitoring component in signal connection with a master station; the two ends of the monitoring-control connector are respectively provided with load release components and are fixedly connected with the two connecting plates, and sides of the two connecting plates further from the monitoring-control component are fixedly connected with the power transmission tower and one end of the insulator string respectively, the other end of the insulator string is hung with wires.